Stream analyser SW/Tool/Smthng...

I'm looking for some tool/SW/whatever that could help in analysing what a stream from a DLNA-server actually is.
I want to see what tags are there, what they contain, what streams, any characteristics of the containers and streams and tags and all...
I want to see what tags are there, what they contain, what streams, any characteristics of the containers and streams and tags and all...